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1. 发明申请

WO2011033401A1 IMAGE INTENSITY CORRECTION FOR MAGNETIC RESONANCE IMAGING 审中-公开
标题翻译：磁共振成像的图像强度校正
公开(公告)号：WO2011033401A1
公开(公告)日：2011-03-24
申请号：PCT/IB2010/053556
申请日：2010-08-05
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , HARVEY, Paul, R. , ROZIJN, Thomas, H. , IJPEREN, Gerrit, H. , PRINS, Willem, M. , MENS, Wilhelmus, R., M. , BENSCHOP, Franciscus, J., M.
发明人： HARVEY, Paul, R. , ROZIJN, Thomas, H. , IJPEREN, Gerrit, H. , PRINS, Willem, M. , MENS, Wilhelmus, R., M. , BENSCHOP, Franciscus, J., M.
IPC分类号： G01R33/565
CPC分类号： G01R33/5659
摘要： A magnetic resonance system comprises : a magnetic resonance scanner including a multi-channel transmit coil or coil system and a magnetic resonance receive element; and a digital processor configured to perform an imaging process including shimming the multi-channel transmit coil or coil system, acquiring a coil sensitivity map for the magnetic resonance receive element using the multi-channel transmit coil or coil system, acquiring a magnetic resonance image using the magnetic resonance receive element and the shimmed multi-channel transmit coil or coil system, and performing an intensity level correction on the acquired magnetic resonance image using the coil sensitivity map to generate a corrected magnetic resonance image.
摘要翻译：磁共振系统包括：包括多通道发射线圈或线圈系统和磁共振接收元件的磁共振扫描器; 以及数字处理器，被配置为执行包括对多通道发射线圈或线圈系统进行匀场的成像处理，使用多通道发射线圈或线圈系统获取用于磁共振接收元件的线圈灵敏度图，使用所述磁共振接收元件和所述散光多通道发射线圈或线圈系统，并且使用所述线圈灵敏度映射对获取的磁共振图像执行强度电平校正，以产生校正的磁共振图像。

2. 发明申请

WO2004070412A1 COMPENSATION OF MAGNETIC FIELD DISTURBANCES DUE TO VIBRATIONS IN AN MRI SYSTEM 审中-公开
标题翻译： MRI系统振动造成的磁场干扰的补偿
公开(公告)号：WO2004070412A1
公开(公告)日：2004-08-19
申请号：PCT/IB2004/050061
申请日：2004-01-29
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , HAM, Cornelis, L., G. , MENS, Wilhelmus, R., M. , GROEN, Johannes, P.
发明人： HAM, Cornelis, L., G. , MENS, Wilhelmus, R., M. , GROEN, Johannes, P.
IPC分类号： G01R33/385
CPC分类号： G01R33/3854
摘要： The invention relates to a magnetic resonance imaging (MRI) system comprising an examination volume (9), a main magnet system (17) for generating a main magnetic field (B o ) in the examination volume, a gradient magnet system (25) for generating gradients of the main magnetic field, and a control system (37) for compensating disturbances of the magnetic field caused by mechanical vibrations of the MRI system. According to the invention, the control system is a feed-forward control system which determines a necessary compensation for said disturbances in dependence on an electric current in the gradient magnet system according to a predetermined response relation. Since in most MRI systems the mechanical vibrations are predominantly caused by the altering electric currents in the gradient magnet system and by eddy currents induced thereby, the invention provides an accurate and reliable compensation for said disturbances, so that artifacts and other distortions of the reconstructed image caused by said disturbances are considerably reduced.
摘要翻译：本发明涉及一种磁共振成像（MRI）系统，包括检查体积（9），用于在检查体积中产生主磁场（Bo）的主磁体系统（17），梯度磁体系统（25）主磁场的梯度，以及用于补偿由MRI系统的机械振动引起的磁场干扰的控制系统（37）。根据本发明，控制系统是前馈控制系统，其根据预定的响应关系，根据梯度磁铁系统中的电流确定对所述干扰的必要补偿。由于在大多数MRI系统中，机械振动主要是由梯度磁体系统中的改变电流和由此引起的涡流引起的，所以本发明为所述扰动提供了精确和可靠的补偿，使得重建图像的伪像和其它失真所造成的干扰大大减少。

3. 发明申请

WO2004090565A1 MAGNETIC RESONANCE IMAGING WITH HISTOGRAM-BASED PHASE CORRECTION 审中-公开
标题翻译：基于组织相位校正的磁共振成像
公开(公告)号：WO2004090565A1
公开(公告)日：2004-10-21
申请号：PCT/IB2004/050394
申请日：2004-04-05
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , MENS, Wilhelmus, R., M.
发明人： MENS, Wilhelmus, R., M.
IPC分类号： G01R33/565
CPC分类号： G01R33/565
摘要： A magnetic resonance imaging system comprises reconstruction unit that is arranged to reconstruct a complex image of complex valued pixels from magnetic resonance signals. A compute a distribution of phase values of the complex image and to apply a phase correction to the complex image to form a corrected magnetic resonance image. The phase correction is controlled on the basis of the distribution of phase values of the complex image. Notably, the histogram power function is an effective indicator of the accuracy of the phase correction.
摘要翻译：磁共振成像系统包括重构单元，其被配置为从磁共振信号重构复数像素的复数图像。 A计算复数图像的相位值的分布，并对复数图像应用相位校正以形成校正的磁共振图像。基于复数图像的相位值分布来控制相位校正。值得注意的是，直方图功率函数是相位校正精度的有效指标。

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